Catching up with a podcast of Start The Week, I was delighted to be pointed in the direction of The Mysteries of the Brain – a series of programmes on BBC World Service by Professor Barry Smith.* In his discussions with Andrew Marr, he referred to experiments carried out by John-Dylan Haynes, which pointed to the illusory nature of free will. Volunteers were asked, repeatedly, to decided whether to press a button with their left or right hand while in an fMRI scanner. Evidence of brain activity, which enabled those reading output to predict with 100% accuracy which hand would be used, appeared up to 7 seconds before the volunteer was aware of their conscious choice. John-Dylan Haynes describes the situation as follows:
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* I first came across Professor Smith in an excellent episode of In Our Time on Ludwig Wittgenstein.